Despite the way I perceive it, the essence remains firm. Simmachus interprets it to mean that as one directs them backward, indicating that they are behind the Gentiles and trailing after them. You shall render the Jews in disbelief. Those from whom God diverts His gaze are ‘laid backward,’ as they cannot stand before Him; by focusing on what is behind, they cannot attain the state where creation will elevate them to the Creator. Their inability to behold the face arises because they lack a pure heart, which alone enables the vision of His posterior, namely, the created beings before Him. Through contemplation of creation, they might begin to understand Him, and by humbling themselves before their God, they can witness the countenance of the Lord.
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The ‘riches’ of God surpass all earthly beings. In Your abundance, You prepare their countenance. He grants them a period for repentance, that they may turn back to Him. This is their invitation to conversion following the ‘fullness of the Gentiles’ (Rom. 11:25).